55 lines
1.5 KiB
JavaScript
55 lines
1.5 KiB
JavaScript
/**
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* @fileoverview A rule to disallow modifying variables that are declared using `const`
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* @author Toru Nagashima
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*/
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"use strict";
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const astUtils = require("./utils/ast-utils");
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//------------------------------------------------------------------------------
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// Rule Definition
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//------------------------------------------------------------------------------
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module.exports = {
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meta: {
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type: "problem",
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docs: {
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description: "disallow reassigning `const` variables",
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category: "ECMAScript 6",
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recommended: true,
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url: "https://eslint.org/docs/rules/no-const-assign"
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},
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schema: [],
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messages: {
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const: "'{{name}}' is constant."
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}
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},
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create(context) {
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/**
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* Finds and reports references that are non initializer and writable.
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* @param {Variable} variable A variable to check.
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* @returns {void}
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*/
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function checkVariable(variable) {
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astUtils.getModifyingReferences(variable.references).forEach(reference => {
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context.report({ node: reference.identifier, messageId: "const", data: { name: reference.identifier.name } });
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});
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}
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return {
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VariableDeclaration(node) {
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if (node.kind === "const") {
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context.getDeclaredVariables(node).forEach(checkVariable);
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}
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}
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};
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}
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};
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